LASCO Activity Report for
August 19, 2004 SOHO Science Daily Meeting

Event times are first frame seen in C2 camera unless otherwise noted.
These are preliminary observations for the daily SOHO science discussions.
Final analysis is reported on the Lasco CME list.
An archive of these reports is available.

Points Of Interest

2004/08/18 (Wednesday)

04:30 UT  WN West	Apparently, a ragged and not well defined front that
			quickly fade in the gusty outflow. 

11:54 UT  S East	Small ragged front that fades throughout C3.

16:54 UT  E Limb	Elongated and ragged loop front followed at 18:30 UT
			by a bright (wider and faster) ragged loop front and
			trailing material. The first front is surpassed by this
			second feature in the C3 FOV. By 18:30 UT extremely 
			faint extensions seem to cover the C2 occultor
			(especially to N). EIT Fe XII runnig difference images	
			show a CME from nearby what later would be NOAA AR 10662
			(nearby N12E28) between ~ 18:12 - 18:48 UT, exhibiting 
			a dimming and an apparent wave to E of the AR.

17:54 UT  WS West	Very bright and wide loop front with structured 
			interior and trailing material. It is preceded a little
			bit to S by a very faint and diffuse front (1), which 
			is quickly surpassed by the 'big' event. Note that GOES
			recorded multiple C-class X-ray activity from NOOA AR
			10656 all along the day. In particular, an X1.8 X-ray
			occurred on that region (by the time at S13W88) between
			17:29 - 17:54 UT with peak emission at 17:40 UT, which
			was clearly associated with the big CME event as 
			depicted in EIT Fe XII running difference images. They
			show a strong brightening right on the W Limb above the
			AR mentioned above peaking at 17:36 UT followed by the
			blow-out of pre-existing structures. Prior to that,
			starting at around 16:24 - 16:36 UT a CME signature is
			seen coming out from apparently right behind the WSW
			limb, likely the EIT counterpart of (1). In particular, 
			a C7.2 X-ray flare was recorded on S12W88 between 
			16:21 - 17:01 UT with peak emission at 16:46 UT.
 
19:31 UT  S East	Slow diffuse loop front developing toward ESE. It fades
			throughout C3.

2004/08/19 (Thursday)

	  S West	Gusty outflow.

02:54 UT  E Limb	Elongated and ragged loop front that fades throughout C3.

04:30 UT  E Limb	Faint loop front begins to be discernible, developing
			slightly toward ESE. Difficutl to give an exact time
			of first appearance.